Another step towards allowing reconnections

1. Implement thread-safe ringbuffer for websocket messages

This implements a ringbuffer that is used to decouple the raw websocket
connection from the messages that the game handler handles.

2. Change websocket handling

With this commit, we stop waiting for the websocket connection to be
established before the game starts.
Now, the Connection type is responsible for waiting for the websocket
connection before writing.

Some bugs are still happening:
	1. The rejoining client is not told the state of the board
	2. Invalid moves are not handled by the client (not sure why though)
	3. The still-connected client should be told, that the opponent
	   disconnected. Then the client should show the passphrase again

3. Introduce method to send status of board and player

4. Reconnect works (kind of)

With the right changes in the client, the reconnect works (but only for
the first time).

WARNING:
At the moment, we will create a new player whenever connection wants to
join a private game. This will also clear all the disconnect callbacks
that we set in the player.

api/move.go

@@ -6,16 +6,18 @@ import (
 )
 
 type WebsocketMessage struct {
-	Type     MessageType       `json:"messageType"`
+	Type        MessageType       `json:"messageType"`
-	Move     *types.Move       `json:"move,omitempty"`
+	Move        *types.Move       `json:"move,omitempty"`
-	Color    *types.ChessColor `json:"color,omitempty"`
+	TurnColor   *types.ChessColor `json:"turnColor,omitempty"`
-	Reason   *string           `json:"reason,omitempty"`
+	PlayerColor *types.ChessColor `json:"playerColor,omitempty"`
-	Position *string           `json:"position,omitempty"`
+	Reason      *string           `json:"reason,omitempty"`
+	Position    *string           `json:"position,omitempty"`
 }
 
 type MessageType string
 
 const (
+	BoardStateMessage  MessageType = "boardState"
 	MoveMessage        MessageType = "move"
 	InvalidMoveMessage MessageType = "invalidMove"
 	ColorDetermined    MessageType = "colorDetermined"
@@ -36,7 +38,7 @@ func (m WebsocketMessage) IsValidMoveMessage() bool {
 }
 
 func GetColorDeterminedMessage(color types.ChessColor) ([]byte, error) {
-	return json.Marshal(WebsocketMessage{Type: ColorDetermined, Color: &color})
+	return json.Marshal(WebsocketMessage{Type: ColorDetermined, PlayerColor: &color})
 }
 
 func GetInvalidMoveMessage(move types.Move, reason string) ([]byte, error) {

chess/free_squares.go

@@ -12,7 +12,6 @@ func (b *Board) GetNonBlockedRowAndColumn(fromSquare types.Coordinate) []types.C
 	nonBlocked = append(nonBlocked, b.getNonBlockedConsecutive(squaresRight, fromSquare)...)
 	nonBlocked = append(nonBlocked, b.getNonBlockedConsecutive(squaresAbove, fromSquare)...)
 	nonBlocked = append(nonBlocked, b.getNonBlockedConsecutive(squaresBelow, fromSquare)...)
-
 	return nonBlocked
 }
 

chess/game.go

@@ -1,12 +1,15 @@
 package chess
 
 import (
+	"context"
 	"log"
+	"math/rand"
 	"mchess_server/api"
 	"mchess_server/types"
-	"time"
 
 	"github.com/google/uuid"
+	"github.com/samber/lo"
+	"nhooyr.io/websocket"
 )
 
 type Game struct {
@@ -15,10 +18,13 @@ type Game struct {
 	players           []*Player
 	currentTurnPlayer *Player
 	gameState         int
+	isBeingHandled    bool
 }
 
 const (
-	PlayerToMove = iota
+	Init = iota
+	Prepare
+	PlayerToMove
 	CheckMove
 	CheckPlayerChange
 )
@@ -27,7 +33,7 @@ func NewGame() *Game {
 	var game = Game{
 		id:        uuid.New(),
 		board:     newBoard(),
-		gameState: PlayerToMove,
+		gameState: Init,
 	}
 	game.board.Init()
 
@@ -42,17 +48,21 @@ func (game Game) GetPlayer1() *Player {
 	return game.players[0]
 }
 
+func (game Game) GetRandomPlayer() *Player {
+	index := rand.Int() % 2
+	return game.players[index]
+}
+
 func (game Game) GetPlayer2() *Player {
 	return game.players[1]
 }
 
 func (game *Game) prepare() {
-	game.currentTurnPlayer = game.GetPlayer1()
+	game.players[0].color = types.White
+	game.players[1].color = types.Black
 
-	ok := game.waitForWebsocketConnections()
+	game.players[0].SetDisconnectCallback(game.playerDisconnected)
-	if !ok {
+	game.players[1].SetDisconnectCallback(game.playerDisconnected)
-		return
-	}
 
 	err := game.notifyPlayersAboutGameStart()
 	if err != nil {
@@ -60,18 +70,35 @@ func (game *Game) prepare() {
 	}
 }
 
+func (game *Game) StartHandling() {
+	if game.isBeingHandled {
+		return
+	}
+
+	game.isBeingHandled = true
+	go game.Handle()
+}
+
 func (game *Game) Handle() {
 	defer game.killGame()
 
-    game.prepare()
+	game.prepare()
 
 	var receivedMove types.Move
-    var err error
+	var err error
 
 	for {
 		switch game.gameState {
+		case Init:
+			game.currentTurnPlayer = game.GetPlayer1()
+			game.gameState = Prepare
+
+		case Prepare:
+			game.prepare()
+			game.gameState = PlayerToMove
+
 		case PlayerToMove:
-			log.Println("with player ", game.currentTurnPlayer, " to move")
+			log.Println("with ", game.currentTurnPlayer.GetPlayerColor(), " to move")
 			receivedMove, err = game.currentTurnPlayer.ReadMove()
 			if err != nil {
 				log.Println("Error while reading message:", err)
@@ -121,25 +148,6 @@ func (game *Game) killGame() {
 	log.Println("Game should be killed")
 }
 
-func (game *Game) waitForWebsocketConnections() bool {
-	timer := time.NewTimer(5 * time.Second)
-	numberOfConnections := 0
-	waitingForPlayers := make(chan bool)
-
-	go game.GetPlayer1().WaitForWebsocketConnection(waitingForPlayers)
-	go game.GetPlayer2().WaitForWebsocketConnection(waitingForPlayers)
-
-	for numberOfConnections < 2 {
-		select {
-		case <-waitingForPlayers:
-			numberOfConnections++
-		case <-timer.C:
-			return false
-		}
-	}
-	return true
-}
-
 func (game Game) notifyPlayersAboutGameStart() error {
 	colorDeterminedPlayer1, err := api.GetColorDeterminedMessage(types.White)
 	if err != nil {
@@ -169,3 +177,15 @@ func (game Game) broadcastMove(move types.Move) error {
 	}
 	return nil
 }
+
+func (game *Game) playerDisconnected(p *Player) {
+	log.Println(string(p.color), " disconnected")
+	playerStillInGame := lo.Filter(game.players, func(player *Player, _ int) bool {
+		return player.color != p.color
+	})
+	game.players = playerStillInGame
+}
+
+func (game *Game) SetWebsocketConnectionFor(ctx context.Context, p *Player, ws *websocket.Conn) {
+	p.SetWebsocketConnectionAndSendBoardState(ctx, ws, game.board.PGN(), game.board.colorToMove)
+}

chess/player.go

@@ -6,34 +6,85 @@ import (
 	"errors"
 	"log"
 	"mchess_server/api"
+	"mchess_server/connection"
 	"mchess_server/types"
-	"time"
 
 	"github.com/google/uuid"
 	"nhooyr.io/websocket"
 )
 
 type Player struct {
-	Uuid              uuid.UUID
+	Uuid               uuid.UUID
-	Conn              *websocket.Conn
+	Conn               *connection.Connection
-	InGame            bool
+	color              types.ChessColor
-	wsConnEstablished chan bool
+	disconnectCallback func(p *Player)
-	context           context.Context
 }
 
 func NewPlayer(uuid uuid.UUID) *Player {
-	return &Player{
+	player := &Player{
-		Uuid:              uuid,
+		Uuid: uuid,
-		Conn:              nil,
+		Conn: connection.NewConnection(
-		InGame:            false,
+			connection.WithContext(context.Background())),
-		wsConnEstablished: make(chan bool),
 	}
+
+	return player
 }
 
-func (p *Player) SetConnection(ctx context.Context, conn *websocket.Conn) {
+func (p Player) hasWebsocketConnection() bool {
-	p.Conn = conn
+	return p.Conn.HasWebsocketConnection()
-	p.context = ctx
+}
-	p.wsConnEstablished <- true
+
+func (p *Player) SetWebsocketConnection(ctx context.Context, ws *websocket.Conn) {
+	p.Conn.SetWebsocketConnection(ws)
+}
+
+func (p *Player) SetWebsocketConnectionAndSendBoardState(
+	ctx context.Context,
+	ws *websocket.Conn,
+	boardPosition string,
+	turnColor types.ChessColor,
+) {
+	p.SetWebsocketConnection(ctx, ws)
+	p.SendBoardState(boardPosition, turnColor)
+}
+
+func (p *Player) SetDisconnectCallback(cb func(*Player)) {
+	// Todo: Fucking complicated
+	p.Conn.SetDisconnectCallback(p.PlayerDisconnectedCallback)
+	p.disconnectCallback = cb
+}
+
+func (p *Player) PlayerDisconnectedCallback() {
+	p.disconnectCallback(p)
+}
+
+func (p *Player) IsInGame() bool {
+	return p.hasWebsocketConnection()
+}
+
+func (p *Player) SendBoardState(boardPosition string, turnColor types.ChessColor) error {
+	var pColor = p.color
+	if p.color == "" { // we default to white if we do not know the color yet
+		pColor = types.White
+	}
+
+	messageToSend, err := json.Marshal(api.WebsocketMessage{
+		Type:        api.BoardStateMessage,
+		TurnColor:   &turnColor,
+		PlayerColor: &pColor,
+		Position:    &boardPosition,
+	})
+	if err != nil {
+		log.Println("Error while marshalling: ", err)
+		return err
+	}
+
+	err = p.writeMessage(messageToSend)
+	if err != nil {
+		log.Println("Error during message writing:", err)
+		return err
+	}
+	return nil
 }
 
 func (p *Player) SendMoveAndPosition(move types.Move, boardPosition string) error {
@@ -56,13 +107,11 @@ func (p *Player) SendMoveAndPosition(move types.Move, boardPosition string) erro
 }
 
 func (p *Player) writeMessage(msg []byte) error {
-	log.Printf("Writing message: %s to player %s", string(msg), p.Uuid.String())
+	return p.Conn.Write(msg)
-
-	return p.Conn.Write(p.context, websocket.MessageText, msg)
 }
 
 func (p *Player) ReadMove() (types.Move, error) {
-	_, receivedMessage, err := p.readMessage()
+	receivedMessage, err := p.readMessage()
 	if err != nil {
 		return types.Move{}, err
 	}
@@ -80,20 +129,13 @@ func (p *Player) ReadMove() (types.Move, error) {
 	return *msg.Move, nil
 }
 
-func (p *Player) readMessage() (websocket.MessageType, []byte, error) {
+func (p *Player) readMessage() ([]byte, error) {
-	msgType, msg, err := p.Conn.Read(p.context)
+	msg, err := p.Conn.Read()
 	log.Printf("Reading message: %s from player %s", string(msg), p.Uuid.String())
 
-	return msgType, msg, err
+	return msg, err
 }
 
-func (p *Player) WaitForWebsocketConnection(c chan bool) {
+func (p Player) GetPlayerColor() string {
-	timer := time.NewTimer(5 * time.Second)
+	return string(p.color)
-
-	select {
-	case <-p.wsConnEstablished:
-		c <- true
-	case <-timer.C:
-		return
-	}
 }

chess/rook_test.go

@@ -18,7 +18,7 @@ func Test_Rook_GetNonBlockedSquares(t *testing.T) {
 		assert.Len(t, squares, 14)
 	})
 
-	t.Run("free row and column", func(t *testing.T) {
+	t.Run("blocked row and column", func(t *testing.T) {
 		board := newBoard()
 		rook := Rook{Color: types.Black}
 		rookCoordinate := types.Coordinate{Col: 5, Row: 5}

connection/message_buffer.go

@@ -0,0 +1,82 @@
+package connection
+
+import "sync"
+
+type MessageBuffer struct {
+	messages           []message
+	getIndex           int
+	insertIndex        int
+	size               int
+	newDataInserted    chan bool
+	firstWriteHappened bool
+	cond               *sync.Cond
+}
+
+type message struct {
+	content string
+	new     bool
+}
+
+func newMessageBuffer(size int) *MessageBuffer {
+	cond := sync.NewCond(&sync.Mutex{})
+
+	return &MessageBuffer{
+		messages:           make([]message, size),
+		size:               size,
+		getIndex:           0,
+		insertIndex:        0,
+		newDataInserted:    make(chan bool),
+		firstWriteHappened: false,
+		cond:               cond,
+	}
+}
+
+func (b *MessageBuffer) Insert(msg string) {
+	b.cond.L.Lock()
+	defer b.cond.L.Unlock()
+
+	oldMessage := b.messages[b.insertIndex]
+	b.messages[b.insertIndex] = message{content: msg, new: true}
+
+	if b.firstWriteHappened &&
+		b.insertIndex == b.getIndex &&
+		oldMessage.new { // insertIndex caught up with getIndex
+		b.getIndex = b.incrementAndWrapIndex(b.getIndex)
+	}
+
+	b.insertIndex = b.incrementAndWrapIndex(b.insertIndex)
+
+	b.firstWriteHappened = true
+	b.cond.Broadcast()
+}
+
+func (b *MessageBuffer) Get() (string, error) {
+	b.cond.L.Lock()
+	defer b.cond.L.Unlock()
+
+	if !b.firstWriteHappened {
+		b.cond.Wait()
+	}
+
+	var msg *message
+	for {
+		msg = &b.messages[b.getIndex]
+		if msg.new {
+			msg.new = false
+			break
+		}
+		b.cond.Wait()
+	}
+	b.getIndex = b.incrementAndWrapIndex(b.getIndex)
+
+	return msg.content, nil
+}
+
+func (b MessageBuffer) incrementAndWrapIndex(index int) int {
+	newIndex := index + 1
+	if newIndex == b.size {
+		newIndex = 0
+	}
+
+	return newIndex
+}

connection/message_buffer_test.go

@@ -0,0 +1,199 @@
+package connection
+
+import (
+	"fmt"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var (
+	message1 = "message-1"
+	message2 = "message-2"
+	message3 = "message-3"
+	message4 = "message-4"
+	message5 = "message-5"
+	message6 = "message-6"
+	message7 = "message-7"
+)
+
+func Test_MessageBuffer_Add(t *testing.T) {
+	buf := newMessageBuffer(3)
+
+	t.Run("insert without wrapping", func(t *testing.T) {
+		buf.Insert("message-1")
+		assert.Equal(t, 1, buf.insertIndex)
+
+		buf.Insert("message-2")
+		assert.Equal(t, 2, buf.insertIndex)
+
+		buf.Insert("message-3")
+		assert.Equal(
+			t,
+			[]message{
+				{content: message1, new: true},
+				{content: message2, new: true},
+				{content: message3, new: true},
+			},
+			buf.messages,
+		)
+	})
+
+	t.Run("insert that causes wrapping", func(t *testing.T) {
+		buf.Insert("message-4")
+		assert.Equal(
+			t,
+			[]message{
+				{content: message4, new: true},
+				{content: message2, new: true},
+				{content: message3, new: true},
+			},
+			buf.messages)
+	})
+}
+
+func Test_MessageBuffer_GetWaitsForFirstData(t *testing.T) {
+	waitTime := 50 * time.Millisecond
+	buf := newMessageBuffer(1)
+	timer := time.NewTimer(waitTime)
+	startTime := time.Now()
+
+	go func() {
+		<-timer.C
+		buf.Insert("delayed-message")
+	}()
+
+	msg, err := buf.Get()
+	assert.NoError(t, err)
+
+	endTime := time.Now()
+
+	assert.Equal(t, "delayed-message", msg)
+	assert.GreaterOrEqual(t, endTime.Sub(startTime), waitTime)
+}
+
+func Test_MessageBuffer_GetWaitsForNewData(t *testing.T) {
+	buf := newMessageBuffer(2)
+
+	buf.Insert("message-1")
+	msg, err := buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, "message-1", msg)
+
+	go func() {
+		timer := time.NewTimer(100 * time.Millisecond)
+		<-timer.C
+		buf.Insert("delayed-message")
+	}()
+
+	msg, err = buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, "delayed-message", msg)
+}
+
+func Test_MessageBuffer_IndexesAreCorrectAfterOverwritingOldData(t *testing.T) {
+	buf := newMessageBuffer(2)
+
+	buf.Insert("message-1")
+	buf.Insert("message-2")
+
+	assert.Equal(
+		t,
+		[]message{
+			{content: message1, new: true},
+			{content: message2, new: true},
+		},
+		buf.messages)
+
+	buf.Insert("message-3")
+	assert.Equal(
+		t,
+		[]message{
+			{content: message3, new: true},
+			{content: message2, new: true},
+		},
+		buf.messages)
+
+	msg, err := buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, "message-2", msg)
+}
+
+func Test_MessageBuffer_GetWaitsForNewDataIfOldOneWasAlreadyGotten(t *testing.T) {
+	buf := newMessageBuffer(2)
+
+	buf.Insert(message1)
+	msg, err := buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, message1, msg)
+
+	buf.Insert(message2)
+	msg, err = buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, message2, msg)
+
+	go func() {
+		<-time.NewTimer(100 * time.Millisecond).C
+		buf.Insert(message3)
+	}()
+
+	msg, err = buf.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, message3, msg)
+
+}
+
+func Test_MessageBuffer_InsertCatchesUpWithRead(t *testing.T) {
+	buf := newMessageBuffer(5)
+
+	buf.Insert(message1)
+	buf.Insert(message2)
+	buf.Insert(message3)
+	buf.Insert(message4)
+	buf.Insert(message5)
+	buf.Insert(message6)
+	buf.Insert(message7)
+
+	msg, err := buf.Get()
+
+	assert.NoError(t, err)
+	assert.Equal(t, message3, msg)
+}
+
+func Test_MessageBuffer_FuckShitUp(t *testing.T) {
+	size := 10
+	buf := newMessageBuffer(size)
+	wg := sync.WaitGroup{}
+
+	wg.Add(2)
+	var readMsg = make([]string, 0)
+	go func() {
+		for i := 0; i < size*10; i++ {
+			msg, _ := buf.Get()
+			if msg == "99" {
+				break
+			}
+			fmt.Println("i = ", i, ": msg = ", msg)
+			readMsg = append(readMsg, msg)
+		}
+		wg.Done()
+	}()
+
+	go func() {
+		for i := 0; i < size*10; i++ {
+			if i%10 == 0 {
+				timer := time.NewTimer(1 * time.Millisecond)
+				<-timer.C
+			}
+			buf.Insert(strconv.Itoa(i))
+		}
+		wg.Done()
+	}()
+
+	wg.Wait()
+	fmt.Println(buf.messages)
+	fmt.Println(readMsg)
+}

connection/type.go

@@ -0,0 +1,108 @@
+package connection
+
+import (
+	"context"
+	"log"
+
+	"nhooyr.io/websocket"
+)
+
+type Connection struct {
+	ws                      *websocket.Conn
+	wsConnectionEstablished chan bool
+	ctx                     context.Context
+	buffer                  MessageBuffer
+	disconnectCallback      func()
+}
+
+func NewConnection(options ...func(*Connection)) *Connection {
+	connection := Connection{
+		buffer:                  *newMessageBuffer(100),
+		wsConnectionEstablished: make(chan bool),
+	}
+
+	for _, option := range options {
+		option(&connection)
+	}
+
+	return &connection
+}
+
+func WithWebsocket(ws *websocket.Conn) func(*Connection) {
+	return func(c *Connection) {
+		c.ws = ws
+	}
+}
+
+func WithContext(ctx context.Context) func(*Connection) {
+	return func(c *Connection) {
+		c.ctx = ctx
+	}
+}
+
+func WithDisconnectCallback(cb func()) func(*Connection) {
+	return func(c *Connection) {
+		if cb != nil {
+			c.disconnectCallback = cb
+		}
+	}
+}
+
+func (conn *Connection) SetDisconnectCallback(cb func()) {
+	conn.disconnectCallback = cb
+}
+
+func (conn *Connection) HasWebsocketConnection() bool {
+	return conn.ws != nil
+}
+
+func (conn *Connection) SetWebsocketConnection(ws *websocket.Conn) {
+	if ws == nil {
+		return
+	}
+
+	conn.ws = ws
+
+	select {
+	case conn.wsConnectionEstablished <- true:
+	default:
+	}
+
+	go func() {
+		for {
+			_, msg, err := conn.ws.Read(conn.ctx)
+			if err != nil {
+				log.Println("while reading from websocket: %w", err)
+				if conn.disconnectCallback != nil {
+					conn.disconnectCallback()
+				}
+				return
+			}
+			conn.buffer.Insert(string(msg))
+		}
+	}()
+}
+
+func (conn *Connection) Write(msg []byte) error {
+	if conn.ws == nil { //if ws is not yet set, we wait for it
+		<-conn.wsConnectionEstablished
+	}
+
+	log.Printf("Writing message: %s", string(msg))
+	return conn.ws.Write(conn.ctx, websocket.MessageText, msg)
+}
+
+func (conn *Connection) Read() ([]byte, error) {
+	msg, err := conn.buffer.Get()
+	if err != nil {
+		conn.ws = nil
+		return nil, err // Tell game-handler that connection was lost
+	}
+
+	return []byte(msg), err
+}
+
+func (conn *Connection) Close(msg string) {
+	conn.ws.Close(websocket.StatusCode(400), msg)
+	conn.ws = nil
+}

go.mod

@@ -22,10 +22,8 @@ require (
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.16.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.17.3 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
 	github.com/leodido/go-urn v1.2.4 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect

go.sum

@@ -1,17 +1,11 @@
 github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
-github.com/bytedance/sonic v1.9.1 h1:6iJ6NqdoxCDr6mbY8h18oSO+cShGSMRGCEo7F2h0x8s=
-github.com/bytedance/sonic v1.9.1/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
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@@ -21,45 +15,24 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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-github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
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@@ -67,8 +40,6 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
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@@ -76,42 +47,22 @@ github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
-github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
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@@ -125,8 +76,6 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.27.10 h1:naR28SdDFlqrG6kScpT8VWpu1xWY5nJRCF3XaYyBjhI=
 github.com/onsi/gomega v1.27.10/go.mod h1:RsS8tutOdbdgzbPtzzATp12yT7kM5I5aElG3evPbQ0M=
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 github.com/pelletier/go-toml/v2 v2.1.0 h1:FnwAJ4oYMvbT/34k9zzHuZNrhlz48GB3/s6at6/MHO4=
 github.com/pelletier/go-toml/v2 v2.1.0/go.mod h1:tJU2Z3ZkXwnxa4DPO899bsyIoywizdUvyaeZurnPPDc=
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@@ -137,49 +86,29 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1 h1:j8whCiEmvLCXI3scVn+YnklCU8mwJ9ZJ4/DGAKqQbRE=
 github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1/go.mod h1:O5hBrCGqzfb+8WyY8ico2AyQau7XQwAfEQeEQ5/5V9E=
 github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
-github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
-github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
 github.com/ugorji/go/codec v1.2.11 h1:BMaWp1Bb6fHwEtbplGBGJ498wD+LKlNSl25MjdZY4dU=
 github.com/ugorji/go/codec v1.2.11/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
-golang.org/x/arch v0.3.0 h1:02VY4/ZcO/gBOH6PUaoiptASxtXU10jazRCP865E97k=
-golang.org/x/arch v0.3.0/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
-golang.org/x/arch v0.5.0 h1:jpGode6huXQxcskEIpOCvrU+tzo81b6+oFLUYXWtH/Y=
-golang.org/x/arch v0.5.0/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
 golang.org/x/arch v0.6.0 h1:S0JTfE48HbRj80+4tbvZDYsJ3tGv6BUU3XxyZ7CirAc=
 golang.org/x/arch v0.6.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.11.0 h1:6Ewdq3tDic1mg5xRO4milcWCfMVQhI4NkqWWvqejpuA=
-golang.org/x/crypto v0.11.0/go.mod h1:xgJhtzW8F9jGdVFWZESrid1U1bjeNy4zgy5cRr/CIio=
-golang.org/x/crypto v0.13.0 h1:mvySKfSWJ+UKUii46M40LOvyWfN0s2U+46/jDd0e6Ck=
-golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
-golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
-golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
 golang.org/x/crypto v0.15.0 h1:frVn1TEaCEaZcn3Tmd7Y2b5KKPaZ+I32Q2OA3kYp5TA=
 golang.org/x/crypto v0.15.0/go.mod h1:4ChreQoLWfG3xLDer1WdlH5NdlQ3+mwnQq1YTKY+72g=
-golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17 h1:3MTrJm4PyNL9NBqvYDSj3DHl46qQakyfqfWo4jgfaEM=
-golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17/go.mod h1:lgLbSvA5ygNOMpwM/9anMpWVlVJ7Z+cHWq/eFuinpGE=
-golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
-golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
-golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
-golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
 golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa h1:FRnLl4eNAQl8hwxVVC17teOw8kdjVDVAiFMtgUdTSRQ=
 golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa/go.mod h1:zk2irFbV9DP96SEBUUAy67IdHUaZuSnrz1n472HUCLE=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@@ -188,12 +117,6 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.12.0 h1:cfawfvKITfUsFCeJIHJrbSxpeu/E81khclypR0GVT50=
-golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
-golang.org/x/net v0.15.0 h1:ugBLEUaxABaB5AJqW9enI0ACdci2RUd4eP51NTBvuJ8=
-golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
-golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
-golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/net v0.18.0 h1:mIYleuAkSbHh0tCv7RvjL3F6ZVbLjq4+R7zbOn3Kokg=
 golang.org/x/net v0.18.0/go.mod h1:/czyP5RqHAH4odGYxBJ1qz0+CE5WZ+2j1YgoEo8F2jQ=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -205,31 +128,17 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20220704084225-05e143d24a9e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
-golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
-golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
 golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
-golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
-golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
@@ -244,9 +153,6 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
-google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
 google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
@@ -256,13 +162,10 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkep
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-nhooyr.io/websocket v1.8.7 h1:usjR2uOr/zjjkVMy0lW+PPohFok7PCow5sDjLgX4P4g=
-nhooyr.io/websocket v1.8.7/go.mod h1:B70DZP8IakI65RVQ51MsWP/8jndNma26DVA/nFSCgW0=
 nhooyr.io/websocket v1.8.10 h1:mv4p+MnGrLDcPlBoWsvPP7XCzTYMXP9F9eIGoKbgx7Q=
 nhooyr.io/websocket v1.8.10/go.mod h1:rN9OFWIUwuxg4fR5tELlYC04bXYowCP9GX47ivo2l+c=
 nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=

lobby_registry/lobby.go

@@ -32,7 +32,7 @@ func newEmptyLobbyWithPassphrase() *Lobby {
 func (l *Lobby) AddPlayerAndStartGameIfFull(player *chess.Player) {
 	l.Game.AddPlayersToGame(player)
 	if l.IsFull() {
-		go l.Game.Handle()
+		l.Game.StartHandling()
 	}
 }
 

main.go

@@ -75,7 +75,7 @@ func hostPrivateGame(c *gin.Context) {
 	u := usher.GetUsher()
 
 	mut.Lock()
-    defer mut.Unlock()
+	defer mut.Unlock()
 	lobby := u.CreateNewPrivateLobby(player)
 	u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
 
@@ -137,7 +137,7 @@ func waitForAndHandlePlayerID(ctx context.Context, conn *websocket.Conn) {
 		return
 	}
 
-	log.Println("read from websocket: ", msgType, string(msg), err)
+	log.Println("read from websocket endpoint: ", msgType, string(msg), err)
 
 	var info api.PlayerInfo
 	err = json.Unmarshal(msg, &info)
@@ -149,14 +149,19 @@ func waitForAndHandlePlayerID(ctx context.Context, conn *websocket.Conn) {
 	}
 
 	lobby := lobbies.GetLobbyRegistry().GetLobbyByUUID(*info.LobbyID)
+	if lobby == nil {
+		conn.Close(websocket.StatusCode(400), "lobby not found")
+		return
+	}
+
 	player, found := lobby.GetPlayerByUUID(*info.PlayerID)
 	if !found {
 		conn.Close(websocket.StatusCode(400), "player not found")
 		return
 	}
-	if player.Conn != nil {
+	if player.Conn.HasWebsocketConnection() {
-		player.Conn.Close(websocket.StatusCode(400), "closing existing connection")
+		player.Conn.Close("closing existing connection")
 	}
-	player.SetConnection(ctx, conn)
+	lobby.Game.SetWebsocketConnectionFor(ctx, player, conn)
 	log.Println("player after setting connection: ", player)
 }

utils/passphrase.go

@@ -12,7 +12,7 @@ func NewPassphrase() Passphrase {
 	var phrase string
 	var retries int
 	var word string
-	var words int = 2
+	var words = 2
 	//TODO make sure passphrases are unique
 	for words > 0 {
 		retries = 20